关于评价彩色图像质量的相关定义，如常用的MSE和PSNR，与灰度图像稍有区别，在图像的滤波、加密恢复等可以用得到。-Associated definitions on the evaluation of the color image quality, such as the commonly used MSE and PSNR slight difference with the grayscale image in the image filtering, encryption can be

运用新的光学加密方法实现图像加密，光学图像加密的密钥空间大。(The new optical encryption method is used to encrypt the image, and the key space of optical image encryption is large.)